1645512232 has 64 divisors (see below), whose sum is σ = 3822739200. Its totient is φ = 646617600.

The previous prime is 1645512227. The next prime is 1645512277. The reversal of 1645512232 is 2322155461.

It is a junction number, because it is equal to n+sod(n) for n = 1645512194 and 1645512203.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102444 + ... + 117412.

It is an arithmetic number, because the mean of its divisors is an integer number (59730300).

Almost surely, 2^1645512232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645512232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1911369600).

1645512232 is an abundant number, since it is smaller than the sum of its proper divisors (2177226968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1645512232 is a wasteful number, since it uses less digits than its factorization.

1645512232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15146 (or 15142 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 1645512232 is about 40564.9138049127. The cubic root of 1645512232 is about 1180.5934561519.

Adding to 1645512232 its reverse (2322155461), we get a palindrome (3967667693).

The spelling of 1645512232 in words is "one billion, six hundred forty-five million, five hundred twelve thousand, two hundred thirty-two".